Botanical extracts as biofungicides against fungal pathogens of rice

Wong Mui Yun, . and Sathyapriya Hamid, . and Nor Afifah Iskandar Shah, . and Nurul Husna Ab Razak, . Botanical extracts as biofungicides against fungal pathogens of rice. pp. 457-466. ISSN 1511-3701

Diseases such as blast brown spot and sheath blight considerably affect the health and productivity of rice worldwide. Chemical fungicides have been routinely used in combating these diseases; however a safe and environmental-friendly approach using bio-fungicides is desirable in disease management of food crop such as rice. Identification of botanical extracts with antifungal potentials would be instrumental in the development of biofungicides. In this study the antifungal potentials of Andrographis paniculata Backhousia citriodora and Phaleria macrocarpa against selected rice fungal pathogens were analysed. Crude extracts obtained from leaves of these plants were diluted to 5 10 15 and 20 and tested against Pyricularia oryzae Exserohilum rostratum and Rhizoctonia solani in vitro using poisoned agar method. Percentage inhibition of diameter growth (PIDG) of each crude leaf extract against test pathogens was calculated. The aqueous extract of A. paniculata showed a significant mycelial inhibitory effect against P. oryzae at 20 concentration (PIDG 81.9) as compared to other test concentrations and pathogens. On the contrary the aqueous extract of B. citriodora at 15 and 20 concentrations had little influence on the mycelial growth inhibition on P. oryzae and E. rostratum with PIDG values less than 50. In addition P. macrocarpa methanol extracts at concentration of 10 and above significantly inhibited the mycelial growth of P. oryzae E. rostratum and R. solani (PIDG 100). Phaleria macrocarpa leaf extract had been identified to give the highest efficacy against all three rice pathogens in vitro and therefore has the potential to be developed into a biofungicide as a safe alternative to synthetic fungicides for disease management of rice.

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Abstract

Diseases such as blast brown spot and sheath blight considerably affect the health and productivity of rice worldwide. Chemical fungicides have been routinely used in combating these diseases; however a safe and environmental-friendly approach using bio-fungicides is desirable in disease management of food crop such as rice. Identification of botanical extracts with antifungal potentials would be instrumental in the development of biofungicides. In this study the antifungal potentials of Andrographis paniculata Backhousia citriodora and Phaleria macrocarpa against selected rice fungal pathogens were analysed. Crude extracts obtained from leaves of these plants were diluted to 5 10 15 and 20 and tested against Pyricularia oryzae Exserohilum rostratum and Rhizoctonia solani in vitro using poisoned agar method. Percentage inhibition of diameter growth (PIDG) of each crude leaf extract against test pathogens was calculated. The aqueous extract of A. paniculata showed a significant mycelial inhibitory effect against P. oryzae at 20 concentration (PIDG 81.9) as compared to other test concentrations and pathogens. On the contrary the aqueous extract of B. citriodora at 15 and 20 concentrations had little influence on the mycelial growth inhibition on P. oryzae and E. rostratum with PIDG values less than 50. In addition P. macrocarpa methanol extracts at concentration of 10 and above significantly inhibited the mycelial growth of P. oryzae E. rostratum and R. solani (PIDG 100). Phaleria macrocarpa leaf extract had been identified to give the highest efficacy against all three rice pathogens in vitro and therefore has the potential to be developed into a biofungicide as a safe alternative to synthetic fungicides for disease management of rice.

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Item Type:	Article
AGROVOC Term:	Rice
AGROVOC Term:	Oryza sativa
AGROVOC Term:	Fungal diseases
AGROVOC Term:	Disease control
AGROVOC Term:	Pathogens
AGROVOC Term:	Botanical pesticides
AGROVOC Term:	Fungicides
AGROVOC Term:	Antifungal properties
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/9536

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